我们如何在Java 9中使用发布-订阅模式来实现Flow API呢？

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Flow API (java.util.concurrent.Flow) 已在 Java 9 中引入。它有助于了解发布商和S订阅者界面交互以执行所需操作的不同方式。

Flow API 由发布者、订阅者、订阅和处理器接口组成，这些接口可以基于反应式流规范。

在下面的示例中，我们可以使用发布者-订阅者接口来实现 Flow API。

示例

import java.util.concurrent.Flow.Publisher;
import java.util.concurrent.Flow.Subscriber;
import java.util.concurrent.Flow.Subscription;

public class FlowAPITest {
   public static void main(String args[]) {
      Publisher publisherSync = new Publisher() {   // Create publisher
         @Override
         public void subscribe(Subscriber subscriber) {
            for(int i = 0; i < 10; i++) {
               System.out.println(Thread.currentThread().getName() + " | Publishing = " + i);
               subscriber.onNext(i);
            }
            subscriber.onComplete();
         }
      };
      Subscriber subscriberSync = new Subscriber() {   // Create subscriber
         @Override
         public void onSubscribe(Subscription subscription) {
         }
         @Override
         public void onNext(Integer item) {
            System.out.println(Thread.currentThread().getName() + " | Received = " + item);
            try {
               Thread.sleep(100);
            } catch(InterruptedException e) {
               e.printStackTrace();
            }
         }
         @Override
         public void onError(Throwable throwable) {
         }
         @Override
         public void onComplete() {
         }
      };
      publisherSync.subscribe(subscriberSync);
   }
}

输出

main | Publishing = 0
main | Received = 0
main | Publishing = 1
main | Received = 1
main | Publishing = 2
main | Received = 2
main | Publishing = 3
main | Received = 3
main | Publishing = 4
main | Received = 4
main | Publishing = 5
main | Received = 5
main | Publishing = 6
main | Received = 6
main | Publishing = 7
main | Received = 7
main | Publishing = 8
main | Received = 8
main | Publishing = 9
main | Received = 9